Guardian Spa Filter Replaces Pleatco PSG25P4, Unicel 4CH-20, Filbur FC-0185, Saratoga Replaces Pleatco PSG25P4, Unicel 4CH-20, Filbur FC-0185 Diameter: 4-3/4'', Length: 6-1/2'', Top: Handle, Bottom: 1-1/2'' MPT Threaded Filter Area: 25 sq ft Filter Material: Reemay (3 oz/yard) New in factory packaging